spongin

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spon·gin

 (spŭn′jĭn)
n.
A sulfur-containing protein similar to collagen that forms the elastic fibrous structure of certain sponges.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

spongin

(ˈspʌndʒɪn)
n
(Biochemistry) a fibrous horny protein that forms the skeletal framework of the bath sponge and related sponges
[C19: from German, from Latin spongia sponge + -in]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

spon•gin

(ˈspʌn dʒɪn)

n.
a fibrous protein that is the main constituent of the skeleton in certain sponges.
[1865–70]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in classic literature ?
You ain't goin' to do no spongin' off me just because I'm marryin' your sister.